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Thread: Washer/sink rough in question - pics included

  1. #1
    DIY Junior Member lisa99's Avatar
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    Default Washer/sink rough in question - pics included

    Hi guys,

    I'm installing a sink in my laundry room and need some input. I've downloaded Terry's picture of a standard washer/laundry sink rough in, but my sink will be about 3 ft to the left of the drain rather than being directly in front of the drain.

    So my question....and I know this is overkill, but to vent the sink which way would you go?

    Picture 1: Terry's "how to" with the sink directly in front of the drain
    Picture 2: Option 1 venting
    Picture 3: Option 2 venting

    Thanks!
    Lisa
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  2. #2
    Forum Admin, Expert Plumber Terry's Avatar
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    Just take the upper tee, swing it to the left in the wall, and 90 el out about 3 feet away.

    The trap arm can have a developed length of 42" to the trap.

  3. #3
    DIY Junior Member lisa99's Avatar
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    Thanks very much Terry!

  4. #4
    DIY Junior Member lisa99's Avatar
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    that leads me to another quick question then.

    Can the sink and washer trap arms come into a 3" line at the same place using a PVC Cross or must they be stacked using two Ts as you've shown in your picture?

  5. #5
    DIY Junior Member lisa99's Avatar
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    After more thought and a lot more research I know why the PVC cross can't be used. I'll be following Terry's picture exactly.

    Thanks

  6. #6
    Moderator & Master Plumber hj's Avatar
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    Default Wm

    Here, that second vent would be overkill. Just one tee for the WM trap and one above it for the sink.

  7. #7
    Forum Admin, Expert Plumber Terry's Avatar
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    Here, that second vent would be overkill. Just one tee for the WM trap and one above it for the sink.
    It works with the single vent, I did it that way too, for about 30 years.
    Now in Washington State, they make us add the second vent.

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